After you installed the printformer Shopify App you see internal printformer informations that are displayed in the cart for a few seconds before they hide.

To hide this information without this delay after reload, you can create a new liquid Snippet with the name filter_product_attributes_cart.liquid

{% assign hideAttributes = "_printformer-hash,_printformer-uid,_printformer-has3d,_printformer-intent,_qtysteps" | split: ','%}

{% unless hideAttributes contains p.first %}
  {{ p.first }}:
    {% if p.last contains '/uploads/' %}
    <a href="{{ p.last }}">{{ p.last | split: '/' | last }}</a>
  {% else %}
    {{ p.last }}
  {% endif %}
{% endunless %}
HTML

Delete all between the following code you find in cart_template.liquid:

{% unless p.last == blank %} ######### {% endunless %}
HTML

and add

{% include 'filter_product_attributes_cart' %}
CODE