Edit: model has arrived http://www.shapeways.com/forum/index.php?t=msg&goto=4620 0&#msg_46200 hi i need help understanding the tolerances of a push fit. i want to make the socket out of SF and the plug out of full color sandstone : 1. if the socket is 2.8mm on all sides then does the plug have to be smaller ?....if so what should the offset be. i want the plugs to be removeable with a reasonable amount of pressure, but nothing that may cause damage 2. the step within the socket.....is 0.2 too small? i dont want it to be crisp, just big enough that it will stop the plug working its way out the other side 3.i have put a fillet of 0.3 on all corners of the triangle, so that i get a neater edge ......will this do anything? 4.is the whole thing too small (aesthetically)? i was debating making the overall plug width 4m. and a adjusting accordingy. i have looked at alot of the material rules, but i find them confusing , any help would great!