FreeTree Sentinel
Sketchfab
26 model
Free
FreeHelix challenge
Printables
FreeBridge Support Challenge
Printables
FreeSupport Settings Test - Torture Mode
Printables
FreeSpanish Express Train
Printables
FreeTorture Spider, 3D-printer torture test - overhangs - cooling - retraction - bed adhesion
Printables
FreeMilo The Martian Test Print
Printables
FreeA more difficult and larger test cube.
Printables
FreeTolerance Test 0.3mm / Difficulty: Very Easy
Printables
FreeTolerance Test 0.25mm / Difficulty: Easy
Printables
FreeTolerance Test 0.2mm / Difficulty: Normal
Printables
FreeTolerance Test 0.15mm / Difficulty: Hard
Printables
FreeTolerance Test 0.1mm / Difficulty: Very Hard
Printables
FreeTolerance Test 0.05mm / Difficulty: Ultra Hard
Printables
FreeAccurate Printer Trophy | Precision Challenge
Printables
FreeImpossible printing test
Printables
FreeElegant Elf Statue – High Detail Fantasy Miniature (3D Printable STL)
Printables
FreeCura Profile 2.0.3.w (remix) for Crealty Ender 3 Pro. For difficult prints
Thingiverse
/https://fbi.cults3d.com/uploaders/40900900/illustration-file/c43f14b4-84f7-4b3c-b9da-b0590ce00f8f/Batch_-_Meat_Boy.gif)
FreeSuper Meat Boy - Keychain and Coin/Badge
Cults3D
FreeA simple DIFFICULT jigsaw puzzle
Thingiverse
FreeTwist Ink Pen MMU2 Challenge
Printables
FreeEvergreen insert - remix of the trays and lids to allow avoiding the shallow trays which can be diffficult
Printables
FreeIntuitive Difficulty RPG/Game Dice (D7 on D20)
Printables
FreeA simple DIFFICULT jigsaw puzzle
MyMiniFactory
FreeBall Maze of varying difficulty
Printables
FreeEvil Puzzle - A difficult puzzle, but made with less filament
Printables