We often put edge-breaking features on the bottom side of parts when printing; the two most common tools in CAD are chamfers and fillets

the short version: use chamfers; filets often print poorly on the bottom of parts as the root of the filet leads to a large overhang

Overhangs in unexpected places

Watch out when placing fillets on the bottom of parts, as you automatically add shallow overhangs:

	Too shallow to print unsupported!

	Too shallow to print unsupported!

When You Really Want Fillets: Hybrid fillets

There are times when you really want to look and feel of fillets, this process approximates a fillet with no steep overhangs


Step 1: Chamfer bottom faces	Step 2: Fillet vertical edge	Step 3: Fillet upper edge of chamfer