Temp- and Tip Tuning – Post-Apocalyptic DIY Projects

On unload, the melted end has to be pulled into a slim, clean tip. A thick or stringy tip blocks the next load. The U1 uses one fixed choreography for all materials; mUlt1ACE makes the pull moves configurable per material. Everything else stays stock, the U1 forms the tip by pulling alone, no cutter.

Full tip forming guide (PDF)

Where to set it

In the Web UI under Config → Tip forming (per material) (validated, can never stall Klipper; the opens a visual builder), or as [ace_tipform] in ace.cfg. Applies after a Klipper restart.

Most important lever first: temperature. Above all, lower the unload temp. Stock pulls PLA at 250 °C. Cooler means a slimmer tip that swells less and loads better through combiner and PTFE. One line, keeps the stock pull, just cooler: pla: unloadtemp:220

Parameters

One table is one line of comma-separated tokens, applied in order:

Token	Meaning
`<mm>@<speed>`	Extruder move. + push, − retract. Speed in mm/min.
`pause:<ms>`	Wait.
`temp:<C>`	Set nozzle target, no wait (M104).
`waittemp:<C>`	Set target and wait (100–350 °C). Moves below 175 °C are rejected.
`fan:<0-255>`	Part fan, inline only (background swap skips it).
`unloadtemp:<C>`	Unload temp for this material (175–350 °C), no move. The whole unload runs at this temp instead of the load temp (default 250).

Rules: at least one move, net sum negative (the tip has to leave the melt zone). Single pull ≤ 200 mm, speed ≤ 6000.

Lookup: <vendor>_<material> → <material> → soft (flexible) → default → stock. Without a matching table, everything stays stock.