Rolive

joined 2 years ago
[–] Rolive@discuss.tchncs.de 2 points 4 hours ago* (last edited 4 hours ago)

I use a small hotplate at about 125 degrees and an aluminium baking tray. If you spread the beads out thinly it will dry pretty quickly.

Alternatively you can use an old microwave and that should remove moisture from the silica gel in a matter of minutes. You can easily overheat them though and I would never use that microwave for food again.

[–] Rolive@discuss.tchncs.de 12 points 1 week ago

Time to cherry pick some workers.

[–] Rolive@discuss.tchncs.de 4 points 1 week ago

A meme about a meme about memes. Impressive.

[–] Rolive@discuss.tchncs.de 4 points 1 week ago

Finally, bull milk!

[–] Rolive@discuss.tchncs.de 2 points 2 weeks ago

Can't complain about that one!

[–] Rolive@discuss.tchncs.de 6 points 2 weeks ago (1 children)

Do you mean the steam deck?

[–] Rolive@discuss.tchncs.de 1 points 2 weeks ago* (last edited 2 weeks ago)

I just use tweezers and a blue flame lighter. Heat it for 5 seconds then put it in the plastic. Then use the back of the tweezers as a flat surface to push it all the way in and level it.

This worked well so far and I really don't see the need for a special soldering iron bit or a press like this.

[–] Rolive@discuss.tchncs.de 1 points 2 weeks ago

I played it too.

[–] Rolive@discuss.tchncs.de 16 points 2 weeks ago (1 children)

Would you like to know more?

[–] Rolive@discuss.tchncs.de 2 points 3 weeks ago* (last edited 3 weeks ago) (1 children)

I got an Orbiter 1.5 extruder and have been quite happy about it since. These days you'd be better off getting an Orbiter 2. As for the toolhead, there should be Ender 5 compatible mounts available on Printables or Thingiverse, if not you could design your own.

Creality also has its own direct drive, the Sprite Pro. That may be worth looking in to as well.

You can import a STEP model of both the Ender 5 and whatever mod you want to make to it and model your toolhead around it, that is what I did with the Mercury One project.

[–] Rolive@discuss.tchncs.de 1 points 3 weeks ago (3 children)

It's worth the effort imo.

[–] Rolive@discuss.tchncs.de 19 points 3 weeks ago (1 children)

Duolingo is so stupidly annoying these days. It has gotten so much worse compared to a few years ago.

Constant bugging, too many popups that are almost as bad as Microsoft products. I want to learn a goddamn language not jump through a hundred hoops every single time.

Not to mention that it all boils down to a guessing game. Some questions have multiple answers and unless you choose that specific one that DuoLingo had in mind it counts as wrong. It also won't tell you why you guessed wrong.

Are there better apps these days?

 

3D printer toolheads often have large blower fans with big fan ducts ending in small holes and I wonder how necessary that is.

These large part cooling setups are most of the size of the toolhead and significantly reduce print area. Blower fans also do not produce much pressure so those fan ducts greatly reduce their effectiveness.

Does it make sense to, instead of using a blower fan, use a small compressor like for an aquarium and have the airflow delivered Bowden style to a small nozzle? The airflow would be substantially higher than from a fan. Noise isn't really an issue for a tiny compressor.

Has anyone tried this? I might eventually but don't have the time to set it up now.

 

This is a WIP and at this point don't know if it's going to be successful or not. I'm currently building it. The idea is to use the Mercury One build but modify it so that it uses 10mm rods on the X axis instead of an aluminium extrusion with an MGN12 rail. I have a set of these rods on hand and want to use the MGN12 rail on a DIY CNC instead. These rods seem good enough for a 3D printer and I don't want to waste them.

I have decided to modify the Mercury One so that it has a different X assembly and a completely custom toolhead that houses the stock Ender5 hotend or a MicroSwiss hotend coupled with an Orbiter 1.5 extruder. Later I'll make a different toolhead for a better hotend but for now the MicroSwiss is good enough.

The red parts are original MercuryOne parts, the green ones are the ones I designed. I haven't bothered with rounding or chamfering yet. I have also imported some things from GrabCAD such as the BLtouch, hotend and fans.

This is quite the Frankenstein creation and I wonder, what am I supposed to call it? It barely resembles an Ender5 at this point, only the frame does.

I feel a bit bad for still using Gdrive but here's the FreeCAD file. I only put things in Gdrive that I want to share publicly so idc if they spy on me. https://drive.google.com/file/d/1WFskq_OpdML4qeyOsKfkcaarW1QUJOB5/view?usp=sharing

 

Hi all. Does anyone have experience with the BMSs from Daly? I'm looking to get a 16s BMS for a DIY li ion battery pack. I have a large box full of li ion 18650 cells and want to make an emergency battery system for home use.

That power outage in Spain motivated me to finish this project.

 

This is for older car models that do not have built-in navigation or bad navigation. My car is old enough to have a cassette player.

This model is made for a Toyota Yaris from 2001 and the phone inside is an S21 Ultra that would otherwise have been sitting in a drawer.

I have sacrificed the original sunvisor to get the swivel part out and modeled a new sunvisor around it. Since this car is really old it's okay to make these modifications.

So far the driving experience has improved a lot, it is a pretty decent location for a navigation system since you can focus on driving much more easily than having to look down and to the right.

The models and FreeCAD design file may be found here:

https://www.printables.com/model/1256013-toyota-yaris-sun-visor-with-navigation-phone

 

We are going to Vietnam this year for holiday and I've read horror stories of poorly distilled alcohol in cocktails and such. Several tourists have died from methanol poisoning.

Would it be feasible to build a small detector for methanol? I'm okay with either a small chemical identification test or something like an IR spectrum analysis.

There are commercial test kits for professional laboratories but I need something affordable for regular consumers.

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submitted 4 months ago* (last edited 4 months ago) by Rolive@discuss.tchncs.de to c/electronics@discuss.tchncs.de
 

This is UV sensitive solder mask resin, applied as thin as possible using a silk screen mesh. Afterwards it's heated at about 90C for 10 minutes. This makes it more sensitive to UV light by evaporating most of the solvent.

It is exposed with a 405nm laser at about 250mw of power. I intentionally unfocused the laser for a spot size of about 0.5nm

After exposure the pads are easily cleaned off with some IPA.

 

I'm currently using an Orbiter 1.5 and it's pretty decent but I'm looking for an upgrade. I like the light style extruder sitting on the gantry over a Bowden system as it allows for flexible filament and has much better control over retraction.

Is the 2.0 a significant improvement over the 1.5? Should I get a new hotend as well with it?

Right now I'm using a MicroSwiss all metal hotend and am quite satisfied with it.

Print speed is okay I guess.

 

Hi all

I've made a detachable toolhead mod for an Ender 5 that uses an MGN12 linear rail on the X axis. It also assumes using an Orbiter 1.5 extruder. The idea is to be able to switch between 3D printing, lasercutting and very light milling easily. The main purpose is to be able to use the Ender 5 for PCB making and that is what the small drill unit is good enough for.

Let me know what you think and feel free to remix it for your own setup!

 

Hi all

Does anyone have any experience with this kit? I'm interested in the linear rail upgrade and CoreXY as well for higher printspeeds.

I sometimes attach a small PCB drill to my Ender5 to help with diy PCBs and may want to try basic CNC milling as well with it.

There are two kits for the Ender5, one for the Ender5 Pro and Ender5 Plus. The difference is in the size of the linear rails. Do the rails for the Ender5 Plus fit on the Ender5? On paper they are smaller than the size of the frame and in the future I might upgrade the Ender 5 to a bigger frame. I don´t mind if they stick out a little bit if it makes upgradability better.

 

Hi there

The purpose of this schematic is to control a DC motor that runs at 8V max. That is why I chose 4 N-channel mosfets in the H bridge. P-channels would not fully activate at voltages above -10Vgs but the N-channels can handle 18V at the gate.

The 5v switches represent an Arduino's digital output pins. One to turn forward, one for reverse. To prevent a failure scenario where both pins are HIGH I added a transistor that prevents current from flowing through the optocoupler on the second half bridge.

Does this circuit make sense? I'm not an electronics engineer, just a hobbyist and have doubts about how effective the gate driving circuit is of the mosfets.

Thanks!

 

According to the A4998 datasheet you're supposed to wait 1 millisecond after waking from sleep to allow the circuit to energise.

What is the worst that can happen if you neglect to do this? I use stepper motors to drive a plant watering pump and losing a step or two really isn't an issue. Is there a risk of damaging the module or is losing the first step the biggest risk?

I trigger the pump by pulling the EN pin low and a 555 timer on the STEP pin makes it pump continuously. It seems sensible to pull the SLP pin down as well with it as that saves a little bit of power.

 

Hi everyone

I've been experimenting with methods of applying etch resist with a laser and dry film. The process is kind of arduous and error prone.

Developing with sodium carbonate solution to clear unexposed etch resist takes long, doesn't work well and if you leave it too long the developed etch resist will break as well.

I use a laser module attached to a 3D printer to draw the PCB (LCB?) on the etch resist. This laser almost instantly solidifies toner for laserprinters and also almost instantly hardens dry film.

Using powdered toner and a laser would be a much quicker way to apply etch resist since the excess can be wiped off and reused easily. The problem is applying a uniform layer of toner.

Suspending toner on the surface of water and hydrodipping the plate seems to work but drying takes too long.

Spray coating could work but is messy.

Isopropyl alcohol softens the toner too much making it impossible to clean the excess off.

I have not tried using a roller or electrostatic application yet but that could work well.

Does any of you have experience with this and have ideas/advice?

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