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Sorry I was at a bike tour for 4 days, just came back early this morning. What kind of change do you need at the valve buttons(the + shaped pillar things :) ) ? Tell me and i'll do it for you AQAP. The inside diameter of the sleeve pipes at the slides are 11mm. outer diameter is 12. So the thickness is 0.5mm. the hole that the pipes will be inserted into the body has 12.2mm diameter to have a tight fit. Can be a bit too tight depending on the finish quality of the 3d printer. A bit enlarging by a hand drill may be necessary or the slides can be inserted for good permanently.
if you want to use normal trumpet valves, then there should be brass sleeves inthe valve block-around the valves for them to work properly. I'm planning an additional version with teflon sleeves around the valves and inside the valve cylinders as well. 3 teflon pipes with necessary holes for pipe routing can be inserted into each valve cylinder at the valve block and valves can be inserted into 3 similar (but smaller in diameter to fit into the first 3) teflon pipes. If teflon on teflon doesn'T work well, then one set of sleeves can be made of plastic or aluminum, stainless steel etc. All trial and error.