One request for easier maintenance on the user end,
If a drop of resin lands in the guide holes or on the resin tank tabs, it can get in the plunger and stay stuck. After unjamming it, it could be interesting if the plunger could easily be changed, for example change the permanent plunger to an screw in version. It could also be accessed form the top to lossen in the case it is seized and the tank is in, this would also prevent damaging the rest of the machine. As for the accuracy of the plunger ocation, i beleive there are some with shoulders or other ways to set them in place.