{"id":240,"date":"2026-07-30T10:05:29","date_gmt":"2026-07-30T09:05:29","guid":{"rendered":"https:\/\/askthenozzle.com\/blog\/z-hop-and-retraction-settings-for-petg-the-numbers-that-actually-stop-stringing\/"},"modified":"2026-07-30T10:05:29","modified_gmt":"2026-07-30T09:05:29","slug":"z-hop-and-retraction-settings-for-petg-the-numbers-that-actually-stop-stringing","status":"publish","type":"post","link":"https:\/\/askthenozzle.com\/blog\/z-hop-and-retraction-settings-for-petg-the-numbers-that-actually-stop-stringing\/","title":{"rendered":"Z-Hop and Retraction Settings for PETG: The Numbers That Actually Stop Stringing"},"content":{"rendered":"

For a direct-drive printer, start PETG at a retraction distance of 1\u20132 mm, a retraction speed of 30\u201340 mm\/s, and Z-hop of 0.2 mm<\/strong> \u2014 then calibrate with a retraction tower. For Bowden, bump the distance to 4\u20136 mm and keep the speed in the same band. Those are working starting points, not gospel: PETG’s melt behaviour varies enough between hotends, extruders and even filament batches that a single “correct” number doesn’t exist. What matters is understanding why<\/em> those figures land where they do, so you can move them in the right direction when the first print still strings.<\/p>\n

That mechanism is the whole story with PETG. Get the z hop and retraction settings petg<\/strong> needs right, and you kill 90% of stringing. Get them wrong \u2014 or ignore the moisture problem underneath them \u2014 and you’ll chase ghosts for hours. Here’s the detail.<\/p>\n

Why PETG strings in the first place<\/h2>\n

PETG is glycol-modified polyethylene terephthalate. The glycol (a second monomer, cyclohexanedimethanol, added during polymerisation) suppresses crystallinity, which is why PETG is a substantially transparent, amorphous polymer with no fixed melting point<\/strong>. That amorphous structure gives PETG its wide processing window and its toughness \u2014 but the same modification lowers molten viscosity and makes the material more hygroscopic.<\/p>\n

Low molten viscosity is the root cause of stringing. Think of the hotend as a caulk gun: when the printhead stops extruding to travel, the low-viscosity PETG inside keeps flowing, oozing out of the nozzle and drawing fine strings across the gap. PETG also has a longer “viscosity tail” than PLA \u2014 it keeps flowing for longer after the extruder stops pushing. That is precisely why you can’t copy PLA retraction values across and expect them to work; PETG needs the melt pulled back further and held there.<\/p>\n

Retraction fights the ooze by physically pulling molten plastic back up the melt zone during travel. Z-hop fights a different problem: the residual blob left at the nozzle tip dragging across and scarring the surface. They solve related but distinct issues, which is why you tune them separately.<\/p>\n

Retraction distance for PETG: the real ranges<\/h2>\n

This is where published advice diverges most, and it’s worth being honest about that spread rather than pretending there’s one figure. The disagreement is real and reflects genuine hardware variation \u2014 the length of your melt zone, whether you run a Bowden tube, and your firmware’s retraction handling all shift the optimum.<\/p>\n\n\n\n\n\n\n\n\n
Source \/ profile<\/th>\nDirect drive<\/th>\nBowden<\/th>\n<\/tr>\n<\/thead>\n
OrcaSlicer Generic PETG default<\/td>\n0.4\u20131.5 mm<\/td>\n2\u20135 mm<\/td>\n<\/tr>\n
Polymaker guidance<\/td>\n1\u20131.5 mm<\/td>\n5\u20136 mm<\/td>\n<\/tr>\n
Common community advice (older)<\/td>\n2\u20134 mm<\/td>\n6\u20138 mm<\/td>\n<\/tr>\n
General slicer guidance<\/td>\n0.5\u20132 mm<\/td>\n3\u20136 mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The practical takeaway: direct-drive setups cluster around 0.4\u20132 mm on modern advice<\/strong> (older guidance pushed 2\u20134 mm), and Bowden setups need 2\u20138 mm<\/strong> because there’s a long, springy PTFE tube absorbing the pull. Modern direct-drive extruders with short melt zones genuinely need very little \u2014 starting at 1 mm and working up is more sensible than starting at 4 mm.<\/p>\n

The upper-limit hazard nobody mentions until it bites:<\/strong> too much retraction, especially on a Bowden machine, causes more problems than it solves. Pull the melt back too far and you invite heat creep<\/strong> \u2014 molten plastic retreating into the cooler portion of the heat break, where it stiffens and jams. Over-retraction is one of the most common self-inflicted PETG clogs. If you find yourself past the top of these ranges and still stringing, the distance is not the problem.<\/p>\n

How to calibrate it properly<\/h3>\n
    \n
  1. Start from a baseline of 0 mm retraction to see the raw ooze behaviour.<\/li>\n
  2. Increase in 0.2 mm steps (direct drive)<\/strong> or 1 mm steps (Bowden)<\/strong>.<\/li>\n
  3. Print a retraction\/stringing tower<\/a> at each value and stop the moment strings vanish.<\/li>\n
  4. If increasing distance further starts causing grinding or under-extrusion gaps<\/strong>, stop \u2014 that’s your signal the problem is moisture, not geometry.<\/li>\n<\/ol>\n

    That last point is the single most useful diagnostic in PETG tuning. Retraction cannot fix wet-filament stringing, so if more retraction only makes things worse, put the calipers down and dry the spool.<\/p>\n

    Retraction speed for PETG<\/h2>\n

    The consensus band here is tighter: 25\u201345 mm\/s<\/strong>, with most people landing around 30\u201340 mm\/s. The mechanism sets the boundaries:<\/p>\n