Thread test rings free - check the fit before printing a screw-on funnel

## What it is Short nut rings for all 20 bottle threads of the screw-on funnels (PCO 1881/1810, 38 mm two-start, GL, GPI), three clearance steps on one bar. The bottle neck passes through the bar. Print, screw onto your bottle, note the step that fits. Test plugs for the screw-in funnels M12 to M42 are a separate free listing. ## Dimensions (measured on the CAD solid) 20 models. Height 7.6-11.6 mm, largest width 83.9-321.6 mm, weight 6.3-42.1 g of PETG if printed solid (an upper bound; with 3 p…

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