My make of the silicone dampeners mould for the printbed screws, for my Prusa i3 P3Steel Toolson Edition 3D Printer that I am currently building. You can keep track of my progress at my blog - http://www.chunkymedia.co.uk/blog/tag/p3steel-build-log/
Video included shows the print process, and also the part fastened together and with moulded parts (the blue bits!) and installed on the print bed. Image should show you my progress and some issues I had(!). I couldn't find a suitable two part silicone compound like Toolson so I did some experiments, first with normal "bathroom" silicone sealant. I though - hey, it's silicone, it's rated to be fairly heat resistant and it is rubbery when set, i'll give it a try. Turns out it shrinks a lot when curing and also tends to only cure on the outside areas which are in contact with air. Ideal for beading a bath with a thin line, but building up a large amount in a hole is basically like squeezing it back into the tube!! After taking the top off after a couple of days watching the front wall cave in it was not even set. I left it out to set so I could pull it out, but no - it sticks well too! Forth picture in you can see my attempts of removing the silicone sealant. After some picking and hacking I gave up and just printed a new base mould. That is why you may see slight colour differences - the first was grey, the second black.
After that mess I thought i would try with some modelling silicone - the type you cast with etc. Looking in my local HobbyCraft I found some stiffer modelling silicone paste which is designed to be a little more rigid that traditional casting silicone. It's called Siligum Moulding Paste and you can find this stuff on Amazon here - http://amzn.to/2eZbZt9. It cast well in the mould and held it's shape. Have been using them for a while and they give good support, are able to be compressed to adjust the bed level and have now shown any sign of deterioration. Just not keen on the blue!
Print Settings Below:
Printer: Printrbot Simple 1405
Filament: 3D Prima 1.75 PLA - Black (Amazon - http://amzn.to/2gfKUXI)
Filament used: 9.611m 28.0g
Layer Height: 0.2064mm
Perimeters: 2 at 0.4mm (0.8mm total)
Time: About 3 hours 55 minutes
Time lapse of the mould print can be found here: - https://youtu.be/Nanm87ZGpkg
Printrbot Simple Makers 1405
Raft was used to keep all parts flat and true with no warping at the edges.