LUBA 2: wheels getting stuck in tall grass and weeds near edges

What happened

An owner running a LUBA 2 (3000X) on terrain with gravel, bushes, and a trampoline reported two recurring, near-daily problems over several months¹:

1. Mowing stops under/near a trampoline and other tight-clearance obstacles. A no-go zone drawn tight around the trampoline's edge, to avoid leaving uncut grass, kept getting the mower physically stuck as it worked around low branches or the trampoline's edge. Its own attempts to dig itself free tore up the grass.
2. Tall grass and weeds near a narrow corridor (a path running along a fence) wrapped around a rear wheel. Weeds leaning over the cutting edge were usually pulled under and cut as normal. Stronger, taller weeds caught the wheel itself, wound around the axle and locked it, and the owner had to free it by hand.

DIY fix: a 3D-printed wheel guard

After fitting a guard, the owner reported no further wheel-wrapping¹. It's a small 3D-printed guard/spoiler over each rear wheel's spring assembly, held on with a single screw per side. It sits close enough to the wheel to stop tall grass and weeds reaching around the axle, without blocking the bumper or getting in the way of normal mowing.

The source gives no design file, printable model or part source. This page records that the approach worked for one owner; it isn't a part you can buy.

Workarounds that don't require printing anything

• Widen no-go zones around trampolines, low branches, and similar tight obstacles. A no-go zone drawn too tight, to leave less uncut grass, was the direct cause of the repeated stalls. Widening it, and accepting a bit more uncut grass at the edge, stopped the mower trying to squeeze through and getting stuck.
• Keep a working path 5–10 cm (2–4 in) clear of fences, rather than running flush against them. Run directly against a wire fence, the mower kept catching and doing half-circle stuck maneuvers. Moving the path 5–10 cm (2–4 in) off the fence line left some uncut weeds right at the fence, but the snagging stopped.
• If the mower stays further back from an edge than needed and leaves a strip uncut, turn off "smart view"/smart obstacle detection for zones under trampolines or low hedges. The owner notes this is a per-zone tradeoff, not something to disable mower-wide.
• Press the grass button twice to lower the cutting deck as far as it goes before you wash underneath. That makes packed grass and mud easier to clean out. The owner warns against a pressure washer: a garden hose is enough, and Mammotion's own guidance also advises against high pressure.

Also confirmed in this report: coverage area is software-limited, not hardware-limited

LUBA 2 models rated for 3,000/5,000/10,000 m² (¾, 1¼ and 2½ acres) all share identical hardware (same battery, same motors); the rated coverage is purely a software limit. The owner confirmed this, and it matches what Mammotion states. In practice any rated model can map roughly 20% beyond its stated area without a reported hardware problem: a 3,000 m² (¾ acre) model maps up to about 3,600 m² (just under an acre).