Warping is often blamed on “the printer,” when the job started before the bed—or the chamber—was actually stable. This post is about using slicer start sequences and Klipper-style temperature waits as process control, not as a bag of secret G-code tricks.
I have not run these printers or flashed firmware for this article. Confirm every command against your machine’s documentation. A start script copied from a different board can heat the wrong heater or skip safety checks.
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What the start of a print is actually for
The first centimeters of a part have to stick while the plastic is already trying to shrink. If extrusion begins while the bed is still climbing, or while a heated chamber is still cold, you have scheduled a thermal gradient into layer one.
Most slicers already emit heat-and-wait commands for the bed and nozzle (commonly in the M140/M190 and M104/M109 family on general FDM profiles). The useful habit is to read your generated start G-code once and ask two questions. Does the printer wait until the bed is at the filament maker’s recommended temperature before the first-layer moves? If the machine has an actively heated chamber, does anything wait for that air temperature, or is the door merely closed?
If you cannot set a chamber temperature, no amount of fancy start G-code will invent a closed-loop heater.
Klipper-style thinking, without cargo-cult macros
Some consumer enclosed printers run Klipper. QIDI documents that the Q2 does, and that it can be used with QIDI Studio as well as third-party slicers such as OrcaSlicer and PrusaSlicer. On Klipper-based machines that actually have a chamber heater, firmware can expose that heater as a controlled object and wait on it the same way it waits on a bed. The principle is simple: do not start the toolpath until the temperatures you claimed in the profile exist in hardware.
I will not paste a copy-ready macro here. Heater names, pin maps, and maximums are machine-specific, and a wrong heater-temperature command is not a harmless tweak. Use the profile and macros the manufacturer ships for your exact SKU, then change one thing at a time.
QIDI rates the Q2’s second-generation independent PTC chamber heating up to 65°C, with a hotend up to 370°C and a bed up to 120°C. Those are official sheet values, not setpoints I have tuned. Official product information is here: qidi3d.com.
Slicer settings that usually matter more than clever G-code
While you are in the start script, keep the first-layer settings honest. Slow the first layer. Use a slightly squished first-layer height. Add a brim on large flat bases. For ABS and ASA, keep early part cooling low unless a specific overhang demands a little air. For PLA, do not preheat a chamber to an engineering setpoint just because the printer can.
Drafts still beat clever firmware. A vent aimed at an open door will undo a perfect wait command. Dry hygroscopic spools before you debug “mystery” layer splits.
If you want a broader, non-firmware warping checklist, I keep one here: How to cut warping on a 3D printer.
A useful debugging habit is to change one thermal condition per test: first-layer speed, bed wait, chamber wait, or part-cooling. If you change all four and the corners stay down, you have learned almost nothing you can reuse on the next model. Save the working start sequence with the filament name in the profile title so you do not “improve” it by accident next week.
The unglamorous win is synchronization: the slicer, the firmware, and the filament maker’s temperature range should be telling the same story before the nozzle draws the first outline.
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