dr_spock

You could try ev3dev. It boots off a micro SD card. It doesn't alter the EV3 firmware. You can still boot the original EV3 firmware and the original EV3 software will still work with it. https://www.ev3dev.org/

The safety data sheet for Kontakt-60 says it contains IPA as one of the ingredients.

Years ago I did something with SG90 servo motor and 3D printing. The trick was setting the angles the servo motor to turn to. It could probably be made to take up less space with shorter arms.

It's so fluffy. Nice work.

It could be they put lower voltage rated motors in those clone L motors. Running them at the higher LEGO spec voltage would make them spin much faster and burn them out eventually. The dummy battery would take the place of one or more of the real batteries in the battery box. You can make them with a wooden dowel cut to length of a AA battery and running a wire from one end to the end of the dowel.

I use a soft makeup blush brush. It works pretty good without scratching the plastic. If you have an air compressor, then a blow gun works great too. Be mindful of the PSI it is set to. :-)

Are those genuine LEGO PF L motors?

60800a were used as bathroom doors in the 41374 Andrea's Pool Party set. 41374-15 by DrSpockFriends, on Flickr

Maybe a collar with an active radio like keyless entry system for cars would be simpler. If the system detects the collar nearby it can send a command to the mindstorm to open the cat door. When the collar is not detected, a close door command can be sent. Infrared sensors could be used to determine if it is safe to close the door. Or activate the water gun if they detect something and collar radio signal is not present.

Nice. Dark pink and neon yellow works really well. Some times industries paint some of their equipment pink in support of breast cancer.

It could be that the PU connectors have an active patent and may need licensing agreement with the TLG. Also PF is no longer produced or sold by LEGO so there is an easy niche market for 3rd parties to fill. I don't use 3rd party. Much cheaper and simpler to 3d print them and reuse old CAT5 wires. It is kind of fun learning to make your own stuff. PF train motors were cheaper than PU train motors and PU remote doesn't need line of sight to control like PF IR.

Canadian 1980s sets have number of pieces listed on the bottom right hand corner.

You could also try to glue shims under your baseplates so that they matches up to the height of the regular plates.

LEGO light bricks are bright enough for low light conditions. Those little button cells won't last very long if left constantly on. The batteries can go bad and leak from sitting in storage too. Measure the current draw of your lighting system, determine how long you want the light to last, and size your power source's amp hours according.

I mainly build MOCs for my LUG's events and shows.