I stumbled on a new technique (at least for me) for reducing support garbage removal and thought somebody else might find it interesting. I designed a power supply mount for Spike2 back box. I wanted to enclose the screw terminals of the PSU to give a little additional safety to accidental shorting of the live wall AC and the 12v output. The end result included basically a 5 sided hollow box that would require support for the "roof". This meant the supports would need to start on the "floor" of the box and would require a lot of removal of the bottom interface layers which tend to fuse to the model more than top interface layers. A separate design choice I made was to add a pattern of hexagon holes anyplace that I thought I could save material without compromising structural need.
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While playing around with PrusaSlicer's paint on support tool, I had an ah-ha moment. I targeted my support enforcers to the holes in the "floor". This meant that the vast majority of support tower's bottom interface were restricted to the build plate. The picture is looking up from the build plate. The blue is where support enforcement is painted on. By manipulating the support painting tool, the brush size can be made to easily paint inside the hex holes. One thing of note I found is that if I made the paint dots too close to the size of the hex holes, the support engine would spill support up and over and would still include a bottom interface layer on the floor of the print.
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The only potential downside is your printer creating a clean first bridged infill layer that builds off of the support towers In my case, this wasn't a problem, but it will come down to material used, general printer bridging performance and the spacing of the holes. If the bridging goes fine, there is a secondary support removal benefit with less interface points to the roof. This picture is looking up at the underside of the box and shows the end of the support towers (green) and the first bridged infill interface layer (dark blue).
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End result of the mount. The Spike games and the SAM vault games use a metal backbox, so I needed to design the mount to work with any available factory mounting screws.
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