Seismograph using 3D printed parts making recipe 2023-03-04

My poster presentation at JpGU2022 is here,
以前のポスター発表は以下のとおり．
http://www.yossi-okamoto.net/2022_JpGU-GeoSciEdIX/JpGU_Poster_Seis_2022finalv2.pdf 

＜Some points to note＞

1) Thermal form change

熱による変形に対処するための処置．
PLAやPETGは熱により変形する．PETGの方がややまし．

PLA and PETG are weak to hot temperature, so the long-time form change is a problem.
Particularly, the deterioration or the bending of the pendulum and the pillar is a big problem.


Thermal bending of the pillar and you can see the pendulum mass is touched on the bottom.

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A solution: to attach acrylic plates to support the pillar against the thermal form change.
Also, the use of PETG rather than PLA at the tropical region is better.
Because the PETG is more withstanding against heat.
支柱の横にアクリル板を圧着するネジ穴を設ける．