mptsoundsSep 7, 2023

3D printed Ergo parts: SLA vs. FDM?

https://lemmy.world/post/4621814

3D printed Ergo parts: SLA vs. FDM? - Lemmy.world

Hi All, I’m planning to print a plate & case for a handwired 46-key split kb. I have access to both SLA & FDM printers at a fab lab, so wondering which printer tech would be best to print various parts such as keycaps, plate, case etc. Function’s more important than looks for me. I’m allowed to use PLA or TPU for the FDM, and the default resin (ABS-like?) for SLA. I’m thinking: - Keycaps: SLA (I want really thin keycaps) - Plate: ?? (not sure what’s better for a thin & durable plate that allows a bit of flex when typing) - Case: FDM (Due to costs, and easy to embed screws & magnets) What do you think?

Show threadHootinNHollerinSep 7, 2023
You’ll want to coat the SLA parts in paint or some other coating that will block UV as they will turn yellowish and more brittle over time from UV. Also, a lot of the TPUs are pretty hard ~90 shore A, so check the hardness value compared to what you’d prefer.
Show threadmptsoundsSep 7, 2023

Thanks for the input. I’ll definitely spray paint the SLA parts. Not sure if spraypainted keycaps will feel more “slippery” but I’ll test first with some of them.

Good point with the TPU. I’m not sure what’s available, but probably Ninjaflex (so 85A?)

Show threadLazaroFilmSep 7, 2023
You could SLA print a key cap to make a silicone mold then use something like Epoxy to make the final key cap.
Show threadmptsounds
Good point! I’ve been considering to print a TPU “sock” of some kind to put on top of a FDM/SLA printed keycap to mimic a silicone (or silicone-like) keycaps, just to see what it feels like. Maybe it’s better to make a mold to try other materials too!
Sep 9, 2023 at 4:40pmWeb
Show threadLazaroFilmSep 9, 2023
Definitely! Make a clean print. You can sand it, fill holes, and sculpt it perfectly before putting your shape in the silicone mold.