EXPERIMENTSIN

PRESS-FITPARTS

A Hackware v2.0 Presentation

By Kenneth Yong

KURT HAMEL

"A round peg may be the last thing youwant for an easy, predictable, first-

try-fit into a round hole. ”

"....a basic toolbox of design ideas that will help you makepress-fit pins that fit the first time, every time."

ROUND PEG/ROUND HOLE

ROUND PEG/ROUND HOLE

"Any variation in design dimensions (eg.length or diameter of pin) or printing

conditions (eg. a different printer,different material, different orientation)

left me guessing what that right clearanceshould be between the pin and the hole."

ALTERNATIVEPIN

DESIGNS

TEST PARAMETERS*

*Approach is not entirely scientific

Time taken in min Amt. of PLA/ ABSused

"Snug-ness" ofpeg's fit to hole

PRINT TIME MATERIAL USED FIT

030201

01 & 02

CURA

+3 0 -3

03Self-devised rating system

PLA ABS

1.0 1.2 1.4

ClassicRound Peg

Generally fast print time

Uses the least material

Generally tight fit forPLA/ ABS

"Centre-Hole" Peg

Generally fast print time

Moderate use of material

Erratic results with PLAGood fit with ABS

"Base-Hole" Peg

Generally slow print time

High usage of material

Great fit for PLALoose fit for ABS

"Rectangle" Peg

Generally fast print time

Higher use of material atlarger dimensions

Tight fit with PLALoose fit with ABS

*Can break when removing supports

"Ribbed" Peg

Relatively quick print time

Low usage of material

Loose fitting withPLA/ABS

"Cross" Peg

Relatively slow print time

Low usage of material

Very tight fitting withPLA/ABS

"Octagon" Peg

Fastest print time

Moderate usage ofmaterial

Very good fitting with PLALoose fitting withs ABS

"Octagon w/ hole"Peg

Slowest print time

Highest usage of material

Very good fitting with PLALoose fitting with ABS

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