Stonehenge

prusaprinters

<p>A great gift to a young person who is into Legos.<br/> Print base plates and top stones. Use Lego bricks (size 2x4) to build columns. The full henge is 30 columns using 180 bricks - 490mm in diameter. The mini henge is 16 columns using 96 bricks - 280mm in diameter. You can use fewer (4 or 5).<br/> I used Prusa PetG left over from our local face shield project. PLA may not be suitable. Base plates are thin (for a reason) and PLA will likely break. Slice at .2mm (speed). Times are 14 min and 20 min.<br/> PetG will weld itself to the Prusa smooth plate. Removal will damage the the PEI. Use glue stick to reduce adhesion. PetG does not stick well to the textured plate, so again use the glue stick. Every two pieces refresh the glue. After about 20 pieces clean the plate and continue. The textured plate plus glue gives a nice stone look to the top stones.<br/> These parts are carefully sized to have a "grip" fit to the Lego bricks. It is important to let them cool to room temperature before removal. I use a 1.5" wide putty knife to wiggle the base plates off of the build sheet.<br/> To protect the build sheet a putty knife should be sanded as smooth as possible. From the factory, blades have grinding marks on the working edge. Place a sheet of fine sand paper on a flat surface. Slide the knife blade along the sand paper, raising and lowering the angle of the blade. Do both sides.<br/> After spreading glue stick, use the putty knife to smooth out glue. Hold knife at shallow angle, press down to flatten blade against print sheet and draw the blade toward you. This gives a nice even layer. My other favorite tool is a brass "tooth brush" which I use to clean the nozzle as the Y axis does its go to home move just before bed leveling. PetG is a bit oozy during warm-up and you want the nozzle clean for the first layer. I use the putty knife to clean the PetG out of the brush.</p>